system-maintenance: Get along with nonexistent OSTree rollbacks

They may have been removed before already.

diff --git a/system-maintenance b/system-maintenance
index ad148ef1162d801541d44f5ddc48f39593a0d7e9..7ec31bf04961b8a04ec0b3be6795e61103b0be8f 100755 (executable)
--- a/system-maintenance
+++ b/system-maintenance
@@ -1,7 +1,7 @@
 #!/bin/sh
 set -eux
 
-rpm-ostree cleanup --rollback
+rpm-ostree cleanup --rollback || true
 rpm-ostree cleanup --repomd
 rpm-ostree cleanup --base